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Fluval Clearmax Phosphate Remover for all filters. It traps phosphate, nitrate and nitrite. It also reduces odours, makes maintenance easier and provided crystal clear water to create ideal condidtions for fish.

Used this in my freshwater tank to keep my phosphates in check (well water). Phosphates testing indicates that this stuff clearly works as intended. I found that one pouch works much longer than the proscribed 3 month schedule they advise.